Theoretical and Experimental Assessment of the Viability of 1,4,6,9-Spiro[4.4]Nonatetrayl as a Reactive Intermediate
<p>Qualitative molecular orbital (MO) theory predicts that 1,4,6,9-spiro[4.4]nonatetrayl (7) should be stabilized via spiroconjugative interaction of the four radical p orbitals. In addition to this thermodynamic stabilization, energetic barriers are predicted for closure to either of the clos...